Use `unset` rather than slicing for bash 3.2 compatibility.
Use `unset` rather than slicing for bash 3.2 compatibility.

Use `unset` to remove the first element of `$_COMMAND_PARAMETERS` rather
than slicing because under bash 3.2 the resulting slice is treated as a
quoted string and doesn't easily get converted back into an array.

alphabetum/osx-cli